LITTLEFIELD, G. L. (1974). Office And Administrative Management System Analysis, Data Prosesing, And Office Service G. L. Littlefield, Frank M. Rachel, Donald L. Garuth. Prentice-Hall of India Private.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)LITTLEFIELD, G. L. Office And Administrative Management System Analysis, Data Prosesing, And Office Service G. L. Littlefield, Frank M. Rachel, Donald L. Garuth. Prentice-Hall of India Private, 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)LITTLEFIELD, G. L. Office And Administrative Management System Analysis, Data Prosesing, And Office Service G. L. Littlefield, Frank M. Rachel, Donald L. Garuth. Prentice-Hall of India Private, 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.